COMBUSTION CONTROL for Petrochemical Furnace
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... Classic Solutions for Combustion Control ... Control by " Simple Cross Limits " and Control by " Double Limits Cross ".
COMBUSTION CONTROL for Petrochemical Furnace
- 1. Combustion Control for Petrochemical Furnace Furnace Air Combustion Fuel Combustion Control Panel & Safety System Panel
- 2. Combustion Control by Cross Limits
- 3. Combustion Control by Cross Limits Air Fuel Ratio calculation: - FLOWAIR = FLOWSTOICHIOMETRIC AIR + FLOWAIR EXCESS - AFR = FLOWAIR / FLOWFUEL => FLOWAIR = AFR x FLOWFUEL => FLOWFUEL = FLOWAIR / AFR Equilibrium Condition => When SP of Combustion Air is Equal SP of Fuel; Increase Load => First it increase SP of Combustion Air, after confirmation it by Flow Transmitter, it increase SP of Fuel; " Safety Condition Decrease Load => First it decreases SP of Fuel, after confirmation it by Flow Transmitter, it decreases SP of Combustion Air. " Safety Condition FLOWAIR FLOWFUELLOAD FLOWFUEL FLOWAIRLOAD
- 4. Combustion Control by Double Cross Limits
- 5. Combustion Control by Double Cross Limits Air Fuel Ratio calculation: - FLOWAIR = FLOWSTOICHIOMETRIC AIR + FLOWAIR EXCESS - AFR = FLOWAIR / FLOWFUEL => FLOWAIR = AFR x FLOWFUEL => FLOWFUEL = FLOWAIR / AFR Equilibrium Condition => SP of Combustion Air is Equal SP of Fuel; Increase Load => It increase SP Combustion Air and SP Fuel at the same time, but it is made between Low Limit and High Limit for ensure the operation condition. ... Safety condition: The measured AFR must not be too different than the adjusted AFR ... Decrease Load => It decrease SP Combustion Air and SP Fuel at the same time, but it is made between Low Limit and High Limit for ensure the operation condition. ... Safety condition: The measured AFR must not be too different than the adjusted AFR ... FLOWAIR FLOWFUELLOAD FLOWAIR FLOWFUELLOAD